Benefits of the FilterBuy 21.5x23.25x1 Filter

• LONG-LASTING

FilterBuy filters are designed to last up to 90 days, 3 times longer than fiberglass filters. If you have pets, kids, or allergy sufferers in your home or business, replace your filters more often to maintain superior indoor air quality and keep your energy costs low.

• MADE IN THE USA

All air filters are manufactured by FilterBuy in the USA using 100% American made components. By purchasing directly from the manufacturer, you’re saving big on a premium product.

• HIGH QUALITY

21.5x23.25x1 pleated air filters are at least 20 times more efficient than fiberglass filters. Filter frames are made of beverage board, which stays strong through humidity and temperatures up to 200° F. Synthetic media provides significantly higher particulate efficiency than standard cotton media.

Specifications

Nominal size

21.5x23.25x1

Actual size

21.5x23.25x1"

Made in

USA

Designed to last

90 days

Pleats per foot

14

Frame made of

Beverage board

Pleats made of

Synthetic media

Certification

Underwriters Laboratories U.L Class 2

Is it Time to Change Your Filter?

Generally, we recommend you replace your air filters every 90 days. Find out below if you should change your filters more often.

If someone in your home has asthma and/or allergies...
...change your filter every 6 weeks to ensure indoor air quality is at its best.

If you have pets...
...change your filter every 2 months to avoid shedding and odor buildup.

If you have young children...
...change your filter every 2-3 months, as having clean air is even more important with children in your home.

If you want to know more about when to replace your air filter, click here.

MERV 6

The 21.5x23.25x1 MERV 6 filter offers basic filtration while removing most particulates from the air.

Traps and blocks 85% of air particles in your space, including pollen, dust mites, and mold.

Ideal for use in basic homes.

MERV 8

The 21.5x23.25x1 MERV 8 filter is our most popular rating, as it filters well in most spaces.

Traps and blocks 90% of air particles in your space, including pollen, dust mites, mold, and large particles like pudding mix.

Ideal for basic and standard homes and businesses.

MERV 11

The 21.5x23.25x1 MERV 11 filter blocks almost all bacteria from the air while keeping proper air flow and minimizing system backpressure.

No problems at all in purchasing filters. They arrived in fine shape in a few days.

W

Wayne B.

Verified Buyer

01/16/2019

Service is always great

Service is always great

J

Jerry P.

Verified Buyer

12/23/2018

filters

great filters, fast shipping and great pricing. I will buy more as needed

R

Robb P.

Verified Buyer

12/17/2018

Quick & Easy

I ordered custom sized filters and they arrived in just a few short days.

E

Edward S.

Verified Buyer

11/09/2018

Hvac filter

Excellant

E

Elizabeth S.

Verified Buyer

10/30/2018

Easy to order.

Order on line was easy and a fast delivery. Great customer service.
Thanks.

D

Diane M.

Verified Buyer

10/04/2018

Thanks for speedy and accurate

Thanks for speedy and accurate shipment

W

william u.

Verified Buyer

09/27/2018

Everything is good

Everything is good

C

Carl K.

Verified Buyer

09/26/2018

Regular Customer

Great products and fast service.

A

Abdel T.

Verified Buyer

09/03/2018

Happy with service

The good thing about ordering here is the quick response and shipping.

E

Edward H.

Verified Buyer

08/16/2018

Hard to find sizes always

Hard to find sizes always available

C

Cathy T.

Verified Buyer

08/14/2018

Customer service was very friendly,

Customer service was very friendly, and very helpful when I called for help on my purchase. My new filters fit great, will order from you again.

N

Nolan L.

Verified Buyer

07/22/2018

Great service, quick delivery.

Great service, quick delivery.

D

DENNIS G.

Verified Buyer

07/15/2018

DENNIS GUY

GOOD

A

Amy L.

Verified Buyer

06/30/2018

Excellent service and quality

We regularly order from FilterBuy as they carry a great selection of the odd size filter our HVAC system requires. Prices are very good and shipping is free. Our recent order order arrived short 2 filters. I emailed customer service, had an almost immediate response and the filters arrived the next day. I believe the true test of a company's commitment to quality is how issues are resolved. TireBuyer exceeded my expectations!

G

George A.

Verified Buyer

06/07/2018

Haven't used yet

Haven't used yet

E

Edit G.

Verified Buyer

06/05/2018

Pleased with the product!

Pleased with the product!

T

Terri P.

Verified Buyer

05/10/2018

Very efficient, easy to understand

Very efficient, easy to understand site and fair prices. Also very quick delivery

Filters fit perfectly and it was a quick and efficient delivery with excellent service!!

O

OSCAR F.

Verified Buyer

12/21/2017

Great value and quality

Great value and quality

H

H P.

Verified Buyer

12/02/2017

Couldn’t find this size anywhere locally

Because we could not find a decent air filter for the odd size required on the air handler on our A/C system we had been using the blue plastic mesh filter the builder installed on our new home. The dust flying in the air was just ridiculous. The best I could do was wash the filter periodically with a hose outside and reinstall it. I looked online and never found a site that offered what I needed at a decent price. One day I heard a radio commercial for FilterBuy and immediately searched for the size we needed. We had a match! I placed an order and within 3 or 4 days I had our filters. They fit perfectly and have been working really well. A few days later I wiped the dust from areas where it had previously collected in order to see if the filters made a difference. Success! Nice job guys...

P

Pat C.

Verified Buyer

11/20/2017

They fit

They fit

P

Pete K.

Verified Buyer

11/12/2017

Great company

Product works and fits perfectly. Each order I make is always shipped promptly. Thank you and keep up the good work.

J

john a.

Verified Buyer

11/11/2017

Perfect

We have a new Carrier AC unit with an unusual filter dimension. FilterBuy has the exact size, and a good quality product too

E

EDWARD B.

Verified Buyer

10/25/2017

Easy to buy the correct

Easy to buy the correct filters

A

alger m.

Verified Buyer

10/14/2017

Filters

Every thing was great

B

Beverly S.

Verified Buyer

09/28/2017

they fit to tight. haven't

they fit to tight. haven't checked the new as of yet, I will let you know

A

ANTONIO P.

Verified Buyer

09/24/2017

good prduct

good prduct

C

Caroline h.

Verified Buyer

08/24/2017

Excellent

Excellent

B

brian b.

Verified Buyer

07/05/2017

ok

ok

W

William R.

Verified Buyer

06/15/2017

Great!

Great!

D

DENNIS G.

Verified Buyer

06/07/2017

getting expensive

getting expensive

N

Nancy W.

Verified Buyer

05/25/2017

Have not used them yet,

Have not used them yet, but last order worked well.

C

Charlotte G.

Verified Buyer

05/04/2017

We are very satisfied

We are very satisfied

J

Judith N.

Verified Buyer

04/24/2017

Very prompt delivery. Filter working

Very prompt delivery. Filter working perfectly. Thanks so much for carrying this off-size filter.

W

William G.

Verified Buyer

03/18/2017

I have not installed yet

I have not installed yet but looks like good quality and proper size with reasonable delivery timeframe

E

Elena R.

Verified Buyer

03/13/2017

Excellent service. Highly recommended!

Excellent service. Highly recommended!

M

Manuel P.

Verified Buyer

03/05/2017

Good!

Good!

C

Charlene T.

Verified Buyer

02/28/2017

So far so good. Can't

So far so good. Can't complain.

K

Kare G.

Verified Buyer

01/24/2017

The new filters will not

The new filters will not be used for another month and a half.

J

James H.

Verified Buyer

01/07/2017

no problems

no problems

R

Robert M.

Verified Buyer

01/05/2017

OK. The service was good.

OK. The service was good. Filters are what we expected.
No surprises, which is even better.

R

Raymond Y.

Verified Buyer

09/07/2016

Very pleased with the quality

Very pleased with the quality of the filters and happy to get a "short-term" filter that's an unusual size. Thanks!

C

Carol G.

Verified Buyer

03/31/2016

Very quick service. Excellent filter.

Very quick service. Excellent filter. Fit perfectly. Thanks.

L

Linda T.

Verified Buyer

09/30/2015

Easy and convienet

Easy and convienet

E

Emil C.

Verified Buyer

10/01/2014

i was confused by the

i was confused by the three different sizes print on the filter, but it was the right filter when i measure

Other Popular 1" Filters

What Customers are Saying

5

Verified Buyer

I am so grateful to have found a quality air filter that is just the right size!

Catie F.

5

Verified Buyer

I was extremely pleased with the customer service that I received. I had purchased the wrong size filter and you guys went above and beyond in order to get me the right ones. You’ve got a customer for years to come.

Rigoberto M.

5

Verified Buyer

Awesome customer service, fast delivery. I will use them whenever I need new filters and will recommend to my friends!

Shirley O.

5

Verified Buyer

The price, delivery, and quality were all excellent. I’m happy to no longer buy from the big box stores! The recurring delivery will help me keep my A/C clean.

Craig M.

5

Verified Buyer

One of the best customer service experiences I’ve had. Great product and great service.

C. P.

5

Verified Buyer

They are fast and efficient, and the filters they provide are top quality. Their customer service is easy to reach. It just does not get any better.

Gary S.

5

Verified Buyer

They always get my filters just in time when I need them. Love it!

Maria R.

5

Verified Buyer

Very pleased with the product and the timely delivery. Saved money and I don't have to search for my odd size filters anymore!

Robert M.

5

Verified Buyer

Very easy and convenient. FilterBuy even had filter sizes for my furnace unit that I couldn’t find anywhere else. Prices are comparable to what I’d pay for the same filter at the store. With free shipping at my own custom interval, this is really unbeatable. I highly recommend for any homeowner.

Jeremy B.

5

Verified Buyer

Convenient way to purchase. Delivered on time and great choices with great prices. Definitely will purchase again. Highly recommend!

Pamela S.

5

Verified Buyer

What a fantastic and easy way to get the filters you need when you need them!

John M.

5

Verified Buyer

Very good filters, great prices and fast delivery.

LaDon J.

5

Verified Buyer

I am so grateful to have found a quality air filter that is just the right size!

Catie F.

5

Verified Buyer

I was extremely pleased with the customer service that I received. I had purchased the wrong size filter and you guys went above and beyond in order to get me the right ones. You’ve got a customer for years to come.

Rigoberto M.

5

Verified Buyer

Awesome customer service, fast delivery. I will use them whenever I need new filters and will recommend to my friends!

Shirley O.

5

Verified Buyer

The price, delivery, and quality were all excellent. I’m happy to no longer buy from the big box stores! The recurring delivery will help me keep my A/C clean.

Craig M.

5

Verified Buyer

One of the best customer service experiences I’ve had. Great product and great service.

C. P.

5

Verified Buyer

They are fast and efficient, and the filters they provide are top quality. Their customer service is easy to reach. It just does not get any better.

Gary S.

Get in Touch

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Build a Custom Size

Simply measure the length and width of your filter with a tape measure and choose the closest size
(to 1/8”) in the drop down menu. 1/8” tolerance is standard and should not cause a problem in any
standard filter application.

Please note that the ‘actual’ filter size, ie the size that your tape measure shows, should be used when
creating a filter with this tool, not a nominal filter size. Note that the depths of each filter are
standard, as shown to the right.

Simply measure the length and width of your filter with a tape measure and choose the closest size
(to 1/8”) in the drop down menu. Please note that the filter depth is standard.